84 



2. Odontostomia (Pyrgulina) Mayii, sp, nov. Pi. iv., fig. 6 



Shell conoidally turreted, relatively solid, dull white. "Whorls 

 five (excl. the heterostrophe apex), separated by a deeply and 

 broadly channelled suture; ornamented by rounded obliquely 

 axial ribs wider than the interspaces, which are not visibly 

 sculptured. Last whorl with about 20 axial ribs, which terminate 

 at a spiral groove on the periphery ; base somewhat flattened and 

 radially ridged, defined by a spiral rib, which margins the 

 peripheral groove. Aperture oval, outer and inner margins 

 joined by a callus, columella-plait stout, almost parietal. 



Length, 2*5; breadth, 1*0 mm. 



Localities. — D'Entrecastreaux Channel, Tasmania, whence 

 type-specimen in my collection received from Mr. W. T. May, 

 after whom the species is named. 



Remarks. — There are several European species of this type of 

 ornamentation presented by 0. Mayii, such as 0. turbonilloides, 

 and one Australian species, 0. Henni, Brazier. From the latter 

 this new species differs (judging by description and figure) by its 

 channelled suture, oblique and stout ribs, and ribbed base. 



Genus Turbonilla. 

 Turbonilla erubeseens, Tate. 



1877. Elusa hifasciata, Tenison-Woods, Proc. Roy. Soc, Tasm., 

 for 1876, p. 150; non Turbonilla hifasciata, A. Adams, 1861. 



1877. Turbonilla f estiva, Angas, Proc. Zool. Soc, p. 35, t. 5, 

 f. 4 ; non Folin, 1867. 



1879. Turbonilla erubeseens, Tate, Trans. Roy. Soc, S. Aust., 

 ii., p. 138, t. 5, f. 10. 



The types which served for the definitions of the forenamed 

 shells are from Tasmania, New South "Wales, and West Australia 

 (King George Sound). Mr. May is satisfied, as the result of 

 comparison of authentic specimens, that the first two are one and 

 the same; I have arrived at a like result in respect of theTasmanian 

 and "West Australian shells. At the time of my definition of 

 T. erubeseens, my knowledge of T. festiva was restricted to the 

 published description and figure ; but now, with actual specimens 

 before me, I find that the alleged differences prove to be 

 invalid. The question remains as to which of the three names 

 should be employed ; as indicated in the above synonymic 

 schedule bifasciata dind festiva have prior use in the genus over 

 their Australian applications, this leaves erubeseens free to be 

 employed. 



The species is also known to me from South Australia and 

 Victoria. 



